2

Blood blisters?:
http://www.webmd.com/skin-problems-and-treatments/tc/blisters-home-treatment
http://en.wikipedia.org/wiki/Blood_blister
What shoes have you been wearing? Switch to Tenis shoes. Some shoes have been rubbing your poor foot?
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4

See a skin doctor:
Keep your feet clean and dry and open to the air soon you get home if there is any history of diabetes or not getting any better you need to see your doctor or preferably a skin doctor
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5

Herpes simplex:
Herpes is one possibility, or this may be "shingles" (herpes zoster). Those lesions are almost always quite tender and painful, although have seen some with only pruritis (itching). If it does not go away you need to see a doctor and have these examined for a diagnosis and approach to therapy.
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9

No but:
it can cause an infection and THAT can go into your bloodstream. You have to monitor that hair splinter closely, if it swells up, gets purulent (pus coming out), hurts, gets hot, etc. signs of abscess then you need to get medical attention right away. Hope this helps and thanks for trusting HealthTap.
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10

Happens...:
Happens in healing process.....keep area clean and dry, use local antiseptic, air the area. Person with heart valve problem, AFib, injection drug user...it will indicate thrombo- embolism...which is dangerous.
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